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Thread: Backwashing 101 - Note to all those new to pools and sand filters

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    Backwashing 101 - Note to all those new to pools and sand filters

    I've just learned after having my pool for 2 seasons (years) that when backwashing, you do so through the waste port. I do not have mine plumed and guess I've been backwashing straight back into the pool. I leave the waste cap on the filter all the time as I've never vacuumed to waste. I had no idea backwashing went through said waste port as well.

    I feel it extremely important to note to advanced users on this forum to add "Backwash & Rinse THROUGH THE WASTE PORT" as a step when talking about clearing algae, pool maintenance, etc.

    I now know why every so often dirt shoots back into the pool through the return and causes further frustration by having to continually vacuum.
    Lucas * South Carolina * 18x33 Oval: 17000 Gallons * AG * Vinyl * Chlorine pucks / Floating Feeder * Well Water * Installed May 2014 * Hayward 18 inch - 150lbs Sand Filter * Hayward Power-flo Matrix Pump - 1.5 HP - 2 Speed * Standard Skimmer * Hayward Aqua Bug * TF-100 Water Test System

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    DaninFLA's Avatar
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    Re: Backwashing 101 - Note to all those new to pools and sand filters

    when in doubt, ask questions. but yes, the idea of backwashing is to remove debris and clean it, not put it back in the pool didn't do any harm other than getting your pool dirty, glad you got it squared away now. welcome to TFP by the way!
    Dan
    9,000 gallon in-ground Saltwater pool, plaster, cartridge filer, 1.0 hp pump, Hayward T-15 SWCG, TF-100
    Pool School - Chlorine / CYA Chart; Pool School - Test Kits Compared;

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    Mod Squad kimkats's Avatar
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    Re: Backwashing 101 - Note to all those new to pools and sand filters

    Good catch! Bet your pool clears up now!

    I will try to remember to add that info. when I am helping someone with that!

    Kim
    TFP Moderator 33x52 round AG 25,600 gals Sand Filter 1.5hp Pump - 2 Speed, SLAM, Pool School, Recommended Levels, Recommended Chemicals, Pool Math, Chlorine/CYA Chart, TF-100 Test Kit

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    Re: Backwashing 101 - Note to all those new to pools and sand filters

    Thanks all - total palm to face moment today when I was watching YouTube videos on how to hard plum my sand filter and saw someone backwashing. When I realized it was from the waste port all the pieces connected!

    I knew I was backwashing, just not in the right way
    Lucas * South Carolina * 18x33 Oval: 17000 Gallons * AG * Vinyl * Chlorine pucks / Floating Feeder * Well Water * Installed May 2014 * Hayward 18 inch - 150lbs Sand Filter * Hayward Power-flo Matrix Pump - 1.5 HP - 2 Speed * Standard Skimmer * Hayward Aqua Bug * TF-100 Water Test System

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    Re: Backwashing 101 - Note to all those new to pools and sand filters

    Quote Originally Posted by cobblucas View Post
    I've just learned after having my pool for 2 seasons (years) that when backwashing, you do so through the waste port. I do not have mine plumed and guess I've been backwashing straight back into the pool. I leave the waste cap on the filter all the time as I've never vacuumed to waste. I had no idea backwashing went through said waste port as well.

    I feel it extremely important to note to advanced users on this forum to add "Backwash & Rinse THROUGH THE WASTE PORT" as a step when talking about clearing algae, pool maintenance, etc.

    I now know why every so often dirt shoots back into the pool through the return and causes further frustration by having to continually vacuum.
    My multiport valve doesn't give me a choice. It has a position that says "Backwash", and it does so through the waste port. I don't see how it's even possible to backwash back into the pool as the multiport closes off the return to the pool.

    Same goes for the rinse setting.

    Are you maybe referring to vacuum to waste?

    Dom
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    Intex 18' X 48" Ultra Frame AGP 6700 gallons | Two Intex CS8110 SWG's | Hayward Pro Series 21" Sandfilter | Hayward 1.5HP Power Flo Matrix pump | Hayward Thru-wall Skimmer | Wanda the Whale | 72 sq ft of Sungrabber Solar Panels with Hayward GLC-2P-A | Taylor K2006 Test Kit, Sample Sizer & Speed Stir | Click Here To Become a TFP Supporter!

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    Re: Backwashing 101 - Note to all those new to pools and sand filters

    What happens if your waste port is capped off? When the multiport is selected for backwash, where would the outgoing water go? I don't have one so I don't know the answer to this one.
    Bob - Palm Beach by San Juan Pools. approx 5000 gals., Pentair 320 cartridge filter (all new guts installed by me), Goldline SWG, 'New to me' Kreepy Krauly Sand Shark, Intermec 104 Timer Test kit: TF-100 w/Speed Stir

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    Re: Backwashing 101 - Note to all those new to pools and sand filters

    Backwashing is usually for sand or DE filters but your signature states you have a cartridge filter. Are you backwashing your cartridge filter?
    21K gal 16' x 40' in-ground pool built 1959, old school with Jacuzzi bronze pump, American Products 24" Sand Filter & Americana Multiport valve, Jandy Lite2 millivolt heater, Coverstar cover, and classic Kreepy Krauly.

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    Re: Backwashing 101 - Note to all those new to pools and sand filters

    Quote Originally Posted by pabeader View Post
    What happens if your waste port is capped off? When the multiport is selected for backwash, where would the outgoing water go? I don't have one so I don't know the answer to this one.
    It would be trapped inside the filter, and would most likely be bad for the multiport valve spider gasket. Backwash flows the water through the sand in reverse, in through where it would normally leave to go to the return, out through the waste, all taken care of automatically with the multiport valve.

    Dom

    - - - Updated - - -

    Quote Originally Posted by gtemkin View Post
    Backwashing is usually for sand or DE filters but your signature states you have a cartridge filter. Are you backwashing your cartridge filter?
    And if you are, can you please post pictures of this setup?

    Dom
    Dom - TFP Guide
    Intex 18' X 48" Ultra Frame AGP 6700 gallons | Two Intex CS8110 SWG's | Hayward Pro Series 21" Sandfilter | Hayward 1.5HP Power Flo Matrix pump | Hayward Thru-wall Skimmer | Wanda the Whale | 72 sq ft of Sungrabber Solar Panels with Hayward GLC-2P-A | Taylor K2006 Test Kit, Sample Sizer & Speed Stir | Click Here To Become a TFP Supporter!

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    Re: Backwashing 101 - Note to all those new to pools and sand filters

    Quote Originally Posted by gtemkin View Post
    Backwashing is usually for sand or DE filters but your signature states you have a cartridge filter. Are you backwashing your cartridge filter?
    The third sentence of that post answers this.

    - - - Updated - - -

    My questions were in relation to Doms posting. Since the OP said their waste port was capped off, the water has to go somewhere, my guess is it goes back into the pool and brings along the yuck from the filter. Maybe they have a bad spider gasket, and that is where the water that would normally go out the waste is leaking by and ending up back in the pool.

    But instead of posting conjecture, I asked a pointed question instead.
    Bob - Palm Beach by San Juan Pools. approx 5000 gals., Pentair 320 cartridge filter (all new guts installed by me), Goldline SWG, 'New to me' Kreepy Krauly Sand Shark, Intermec 104 Timer Test kit: TF-100 w/Speed Stir

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    DaninFLA's Avatar
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    Re: Backwashing 101 - Note to all those new to pools and sand filters

    Quote Originally Posted by gtemkin View Post
    Backwashing is usually for sand or DE filters but your signature states you have a cartridge filter. Are you backwashing your cartridge filter?
    +1, I saw that as well and figured it was an old filter or typo?
    Dan
    9,000 gallon in-ground Saltwater pool, plaster, cartridge filer, 1.0 hp pump, Hayward T-15 SWCG, TF-100
    Pool School - Chlorine / CYA Chart; Pool School - Test Kits Compared;

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    Re: Backwashing 101 - Note to all those new to pools and sand filters

    mea culpa - i was responding to questions that were not directed to me. I assumed that the OP had the appropriate filter, didn't check the sig, and thought i was the person yall were asking about the cartdrige filter.
    I will go into the dunce corner for a little while. I deserve it!! 😒

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    DaninFLA's Avatar
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    Re: Backwashing 101 - Note to all those new to pools and sand filters

    Quote Originally Posted by pabeader View Post
    mea culpa - i was responding to questions that were not directed to me. I assumed that the OP had the appropriate filter, didn't check the sig, and thought i was the person yall were asking about the cartdrige filter.
    I will go into the dunce corner for a little while. I deserve it!! ��
    bad boy! we will let you know when you can come out, haha

    I think OP has a sand filter, he said sand filter in his second post I believe.
    Dan
    9,000 gallon in-ground Saltwater pool, plaster, cartridge filer, 1.0 hp pump, Hayward T-15 SWCG, TF-100
    Pool School - Chlorine / CYA Chart; Pool School - Test Kits Compared;

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    gtemkin's Avatar
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    Re: Backwashing 101 - Note to all those new to pools and sand filters

    We'll, the OP has contradictory information, saying cartridge filter in signature and sand filter in one post. The OP needs to clear that up before we can provide useful advise on this topic.
    21K gal 16' x 40' in-ground pool built 1959, old school with Jacuzzi bronze pump, American Products 24" Sand Filter & Americana Multiport valve, Jandy Lite2 millivolt heater, Coverstar cover, and classic Kreepy Krauly.

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    Re: Backwashing 101 - Note to all those new to pools and sand filters

    Tired. Pabeader, you are a fave of mine. I was confused too! No worries!

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